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JEE Main Test 124
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JEE Main Test 124
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  • Question 1/10
    4 / -1

    1.2 g of organic compound on Kjeldahlization liberates ammonia which consumes 30 cm of 1 N HCI. The percentage of nitrogen in the organic compound is .. 

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  • Question 2/10
    4 / -1

    29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HC1 solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is

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  • Question 3/10
    4 / -1

    Which one of the following compounds gives white precipitate with AgNO3?

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  • Question 4/10
    4 / -1

    Consider separate solution of 0.500 M C2H5OH(aq), 0.100 M Mg3 (PO4)2 (aq), 0.250 M KBr (aq) and 0.125 M Na3PO4 (aq)2 at 25° C. Which statement is true about these solution assuming all salts to be strong electrolytes.

    Solutions

    Colligative properties depend on the number of solute particles present in the solution and their concentration.

    Hence,

    Osmotic pressure = (effective molarity of solution)(ideal gas constant)(absolute temperature).

    Here, effective molarity = Van’t Hoff factor × molarity

    ∴0.5 M C2H5OH(aq) i =1 effective molarity = 0.5M

    0.1M Mg3(PO4)2(aq) i = 5 × effective molarity = 0.5M

    0.25M KBr(aq) i = 2× effective molarity = 0.5M

    0.125M Na3PO4(aq) i = 4× effective molarity = 0.5M

    Hence all colligative properties are same. Therefore they all have same osmotic pressure.

     

     

  • Question 5/10
    4 / -1

    If the H+ concentration decreased from 1 M to 10-4 M at 25oC for the couple MnO-4/ Mn2+, then the oxidisting power of the MnO-4/ Mn2+ couple decreases by

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  • Question 6/10
    4 / -1

    Consider the reaction, 2A + B → products When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is

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  • Question 7/10
    4 / -1

    For Freundlich isotherm, a graph of a log x/m is plotted against log p. The slope of the line and its y-axis intercept, respectively corresponds to

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  • Question 8/10
    4 / -1

    The velocity of oxidation of oxalic acid by acidified KMnO4 increases as the reaction progress. It is an example of

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    Autocatalysis is a phenomenon in which one of its products of a reaction acts as a catalyst.

    When KMnO4  solution is added to oxalic acid, the disappearance of pink colour occur initially but as soon as some  MN2+ ion are formed the disappearance of colour becomes fat.

     

  • Question 9/10
    4 / -1

    Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of

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  • Question 10/10
    4 / -1

    A radioactive substance takes 20 min to decay 25%. How much time will be taken to decay 75% ?

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